A project log for Classic HP Calculator LiPo Battery Pack

Safe and convenient power for HP 35/45/55/67 Calculators

tomcircuittomcircuit 11/18/2020 at 19:570 Comments

This was a fun and easy project, and it went perfectly.  Well, nearly.  Had to swap the LiPo leads in the JST connector to match the polarity that I assumed on my PCB. Otherwise, no issues at all.